Coal stoker



A. E. BAUM COAL STOKER March 18, 1941.

Filed July 29, 1939 Brmentor Albert EBczzu/w BB Gttomeg Patented Mar. 18, 1941 COAL STOKER Albert E. Baum, Waterloo, Iowa Application July 29, 1939, Serial'No. 287,287

1 Claim.

My invention relates to improvements in coal stokers, and an object of my invention is to supply a device of simple construction, inexpensive and suitable for delivering fuel into a furnace,

and in a manner for creating complete combustion therein without production of smoke or other loss. 7

Another object of my invention is to include in the apparatus an effectively driven means for delivering comminuted fuel into the furnace in regulated portions with means in the furnace for receiving the fuel thereupon and in a manner insuring complete combustion thereof.

Another object of my invention is to include in said delivery apparatus devices for locking the operating means against displacements in either of opposite directions.

Another object of my invention is to furnish in combination with a traveling carrier mechanism, a tubular device composed of a loosely assembled, deformable, flexible part and a rigid part shaped for end-delivery purposes whereby the fuel may be delivered into and through an aperture of a furnace door and into the fire-box in a convenient manner to supply fuel in a distributed mass most suitable for the creation of perfect combustion of the spread fuel.

Another object of 'my invention is to shape the rigid part of the delivery tube suitably to removably traverse an aperture in a furnace door, and also provide in the latter section a gravitycontrolled closure normally interrupting its delivery spout.

All of these improvements are contained in my invention, and are hereinafter described, claimed,

and illustrated in the accompanying drawing, it being understood that various minor changes may be effected in the elements of my device, without departing from my invention or from. the scope of said claim.

Referring to the drawing, Fig. 1 is a side elevation of my improved coal stoker, with parts in section or broken away, and shown in an operative condition. Fig. 2 is a horizontal section of the fuel reservoir and the special mechanism beneath it for operating the endless carrier of the fuel to a furnace to be supplied, parts of the carrier being broken away. Fig. 3 is an enlarged top plan of the boxing with a removable cover broken away, for a contained pair of coacting worm gear-like devices, lockingly adapted to prevent accidental displacements of the mechanical connections between a motor and the traveling apron or fuel conveyor.

It is my purpose to supply a stoker of the utmost simplicity and cheapness, which will nevertheless suitably serve its operator and for use particularly in small installations.

Referring to the drawing, the numeral I denotes an open top container havin side and bottom walls, with an intermediate sloping partition 2, the .upper compartment serving to receive comminuted fuel to be delivered to the cups of an endless carrier mechanism, while the lower compartment contains a motor and a train of devices including a pair of sets of worm gears for preventing forward or retrograde movements of the carrier mechanism. The partition 2 slopes downwardly to deliver fuel into a concaved connection 4 between the container and an inclined raceway 4a thus supported on said container.

The raceway 4a has sides but is open above its bottom, and sheaves 5 and 6 are mounted on pintles rotatably as at 2| at top and bottom ends of the raceway. This pair of sheaves carries an endless belt 1 upon whose outer face are secured U-shaped fuel carriers.8 all directed in one direction and spaced evenly apart.

Returning to Figs. 2 and 3 which display the coacting mechanisms between a motor 34 fixed on a base-plate 35 on the lowermost floor of the container I, said motor has the usual rotary shaft 33 traversing a bearing 32 and carrying a terminal relatively small grooved sheave 3|. The numeral 36 denotes an open top box having a removable cover 31 separably secured by screws 38 to each other. In this box are mounted a pair of like sets of worm gearings 394I and 42-43 mounted on shafts 26a and 21a respectively, one crossing the other and with the outer parts 26 and 21 respectively positioned without the box oppositely and with diminished ends or end portions as at 24 and 28 each carrying a sheave, the sheave 29 on the shaft part 28 being of larger diameter than a sheave 25 on the oppositely directed shaft part 24. A cable 30 connects the sheaves 3| and 29, while a smaller sheave 25 on the shaft 24 is connected by a cable 22 to an exterior larger sheave 23 on the projected shaft 2| of the lower sheave 5 for the conveyer belt I. A cross-shaft 40 carries the gear 42. It will be seen, that the sheaves 29 and 23 respectively are of greater diameters than the sheaves 3| and 25, whereby the rapid rotation of the motor shaft 33 in this train, thereby slows down the rotation of the belt-carrying roller or sheave 5 considerably, thus causing the belt I with its entrained carrier bodies 8 to move upwardly and forwardly slowly in transferring the portions of comminuted fuel in the bodies 8 in turn to be delivered downwardly in succession into the widened upper open termination of the flexible leather or other kind of yieldable curvate section 9 of the fuel delivery means.

A tubular metal section I0 receives thereinto at its upper end the lower termination of the leather section 9 loosely, so that when the fire door II, apertured to receive the outwardly curved part of the section I0 therethrough, may be swung open when desired, the section I 0 is turned on the lower part of the leather section 9 according to the swing of the door. The furnace door I1 being swingably connected to the furnace within its door opening, and the lower curved end part of the section I0 loosely inserted in an aperture in the door to communicate with the furnace and to deliver fuel upon the grate below and also upon the apex of the perforated conical part 20, whereby the door I! may be swung open, to also rock or swing the section with the door loosely, so that the upper end part of the section II] will turn freely around the curved section 9, with little if any distortion of the latter and without separating therefrom. When the furnace door I! of the furnace I6 is closed, it may thus deliver the fuel over and upon an upwardly coned part 29 of a grate device I9, said part 20 being supplied with a plurality of air holes, and which supply air to an even layer of the fuel upon the cone, where its distribution causes perfect and even combustion of the fuel smokelessly.

As shown in said Fig. 1, a damper device I2 is mounted rockably on a pintle II traversing the depending metal section I0, and an arm I5 fixed and depending from said pintle carries an end weight I4 which normally causes the damper I2 to cross and close the interior of said section. When a loading of fuel is deposited upon the damper, it swings open downwardly to discharge its load through the lower curvate part of the section upon the cone 20 of the furnace, and then reacts upwardly by coercion of the weight I4 to reclose said section. The sections 9 and I0 are loosely associated so that the section I0 may be freely movable on said section 9. The container may be provided with spaced side projecting walls 3 to prevent escape laterally of fuel in transit to the carrier device 1-8.

I claim:

Inia furnace stoker, in combination, a flexible downturned tube adapted to be fixedly supported at its upper end to receive and deliver fuel therethrough, a tubular device with upper end loosely sleeved about the lower end of the flexible tube, the tubular device having its lower part diminished and curved laterally, and offset at one side where diminished with the offset part of its wall longitudinally slotted, a plate valve crossing the tubular device tiltably, and an arm rigidly connected to the plate angularly and traversing the slot in said wall with a weight mounted on its outer end, and the lower laterally curved end part of the tubular device shaped and directed to traverse an opening in a hinged furnace door to deliver fuel into the furnace.

ALBERT E. BAUM. 

